A156419 Number of 15 X 15 arrays of squares of integers, symmetric about the diagonal and under 90-degree rotation, with all rows summing to n.

1, 0, 0, 0, 6912, 0, 0, 0, 146160, 0, 0, 0, 1414567, 0, 0, 804511, 5450892, 0, 0, 0, 27519912, 0, 0, 5291400, 57290800, 0, 0, 0, 122542980, 0, 0, 132416760, 494160114, 0, 0, 0, 559024692, 0, 0, 586240030

Offset

0,5

Links

Table of n, a(n) for n=0..39.

Crossrefs

Sequence in context: A233245 A233223 A106768 * A268908 A192077 A272913

Adjacent sequences: A156416 A156417 A156418 * A156420 A156421 A156422

Keyword

nonn

Author

R. H. Hardin, Feb 09 2009

Status

approved